package com.example.demo.services.impl;

import com.example.demo.common.AppResult;
import com.example.demo.common.ResultCode;
import com.example.demo.dao.ArticleMapper;
import com.example.demo.exception.ApplicationException;
import com.example.demo.model.Article;
import com.example.demo.model.Board;
import com.example.demo.model.User;
import com.example.demo.services.IArticleService;
import com.example.demo.services.IBoardService;
import com.example.demo.services.IUserService;
import com.example.demo.utils.StringUtil;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

@Service
@Slf4j
public class ArticleServiceImpl implements IArticleService {

    @Resource
    private ArticleMapper articleMapper;

    @Resource
    private ObjectMapper objectMapper;

    //用户和板块的操作
    @Resource
    private IUserService userService;
    @Resource
    private IBoardService boardService;
    @Override
    public void creat(Article article) {
        //非空校验
        if(article == null || article.getUserId() == null || article.getBoardId() == null
                || StringUtil.isEmpty(article.getTitle())
                || StringUtil.isEmpty(article.getContent())){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //设置默认值
        article.setVisitCount(0);//访问数
        article.setReplyCount(0);//回复数
        article.setLikeCount(0);//点赞数
        article.setDeleteState((byte)0);
        article.setState((byte)0);
        //增加8小时时间，不知道为什么一直改不对时间，数据库中的时间正确，但是从数据库读出来就变成少8小时
        Date date = new Date();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.HOUR_OF_DAY, 8);
        article.setCreateTime(calendar.getTime());
        article.setUpdateTime(calendar.getTime());
        //写入数据库
        int articleRow = articleMapper.insertSelective(article);
        if(articleRow<=0){
            log.warn(ResultCode.FAILED_CREATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        //获取用户信息
        User user = userService.selectById(article.getUserId());
        //没有找到指定的用户信息
        if(user==null){
            //后端需要根据这些信息来差bug
            log.warn(ResultCode.FAILED_CREATE.toString()+",发帖失败，userid = "+ article.getUserId());
           //后端不管前端直接返回
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        //更新用户的发贴数量
        userService.addOneArticleCountById(user.getId());

        //获取板块信息
        Board board = boardService.selectById(article.getBoardId());
        //是否在数据库中有对应的版块
        if(board == null){
            //后端需要根据这些信息来差bug
            log.warn(ResultCode.FAILED_CREATE.toString()+",发帖失败，board = "+ article.getBoardId());
            //后端不管前端直接返回
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        //更新版块中的帖子数量
        boardService.addOneArticleCountById(board.getId());

        //打印日志
        log.info(ResultCode.SUCCESS.toString()+",user id = "+article.getUserId()
                +",board id"+article.getBoardId()+", article id ="+article.getId()+"发帖成功");

    }

    @Override
    public List<Article> selectAll() throws JsonProcessingException {
        //调用DAO
        List<Article> articles =  articleMapper.selectAll();

        //返回结果
        return articles;
    }
    @Override
    public List<Article> selectAllByBoardId(Long boardId) {
        // 非空校验
        if (boardId == null || boardId <= 0) {
            // 打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 校验版块是否存在
        Board board = boardService.selectById(boardId);
        if (board == null) {
            // 打印日志
            log.warn(ResultCode.FAILED_BOARD_NOT_EXISTS.toString() + ", board id = " + boardId);
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }
        // 调用DAO，查询
        List<Article> articles = articleMapper.selectAllByBoardId(boardId);

        // 返回结果
        return articles;
    }

    @Override
    public List<Article> selectByUserId(Long userId) {

        // 非空校验
        if (userId == null || userId <= 0) {
            // 打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 校验用户是否存在
        User user = userService.selectById(userId);
        if (user == null) {
            // 打印日志
            log.warn(ResultCode.FAILED_USER_NOT_EXISTS.toString() + ", user id = " + userId);
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_NOT_EXISTS));
        }
        // 调用DAO
        List<Article> articles = articleMapper.selectByUserId(userId);
        // 返回结果
        return articles;
    }

    @Override
    public Article selectDetailById(Long id) {
        // 非空校验
        if (id == null || id <= 0) {
            // 打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 调用DAO
        Article article = articleMapper.selectDetailById(id);
        // 判断结果是否为空
        if (article == null) {
            // 打印日志
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        // 更新帖子的访问次数
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        updateArticle.setVisitCount(article.getVisitCount() + 1);
        // 保存到数据库
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            // 打印日志
            log.warn(ResultCode.ERROR_SERVICES.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
        // 更新返回对象的访问次数
        article.setVisitCount(article.getVisitCount() + 1);
        // 返回帖子详情
        return article;
    }

    @Override
    public Article selectById(Long id) {
        // 非空校验
        if (id == null || id <= 0 ) {
            // 打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //调用dao
        Article article = articleMapper.selectByPrimaryKey(id);
        //返回结果
        return article;
    }

    @Override
    public void modify(Long id, String title, String content) {
        // 非空校验
        if (id == null || id <= 0 || StringUtil.isEmpty(title)
                || StringUtil.isEmpty(content)) {
            // 打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 构建要更新的帖子对象
        Article updateArticle = new Article();
        updateArticle.setId(id); // id
        updateArticle.setTitle(title); // 标题
        updateArticle.setContent(content); // 正文
        updateArticle.setUpdateTime(new Date()); // 更新时间
        // 调用 DAO
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            // 打印日志
            log.warn(ResultCode.ERROR_SERVICES.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
    }

    @Override
    public void thumbsUpById(Long id) {
        // 非空校验
        if (id == null || id <= 0) {
            // 打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 获取帖子详情
        Article article = articleMapper.selectByPrimaryKey(id);
        // 帖子不存在
        if (article == null ||article.getDeleteState() == 1) {
            // 打印日志
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        // 帖子状态异常
        if (article.getState() == 1) {
            // 打印日志
            log.warn(ResultCode.FAILED_ARTICLE_BANNED.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_BANNED));
        }
        // 构造要更新的对象
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        updateArticle.setLikeCount(article.getLikeCount() + 1);
        updateArticle.setUpdateTime(new Date());

        // 调用DAO  //保存到数据库
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            // 打印日志
            log.warn(ResultCode.ERROR_SERVICES.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
    }

    @Override
    public void deleteById(Long id) {
        // 非空校验
        if (id == null || id <= 0) {
            // 打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 根据Id查询帖子信息
        Article article = articleMapper.selectByPrimaryKey(id);
        if (article == null || article.getDeleteState() == 1) {
            // 打印日志
            log.warn(ResultCode.FAILED_BOARD_NOT_EXISTS.toString() + ", article id = " + id);
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }
        //删除就是在重新创建一个对象来保存原来的值，只不过是将数量减一和设置为已删除
        // 构造一个更新对象
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        updateArticle.setDeleteState((byte) 1);
        // 调用DAO
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            // 打印日志
            log.warn(ResultCode.ERROR_SERVICES.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
        // 更新版块中的帖子数量
        boardService.subOneArticleCountById(article.getBoardId());
        // 更新用户发帖数
        userService.subOneArticleCountById(article.getUserId());
        log.info("删除帖子成功, article id = " + article.getId() + ", user id = " + article.getUserId() + ".");
    }

    @Override
    public void addOneReplyCountById(Long id) {
        // 非空校验
        if (id == null || id <= 0) {
            // 打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 获取帖子记录
        Article article = articleMapper.selectByPrimaryKey(id);
        // 校验帖子状态
        if (article == null || article.getDeleteState() == 1) {
            // 打印日志
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        // 帖子已封帖
        if (article.getState() == 1) {
            // 打印日志
            log.warn(ResultCode.FAILED_ARTICLE_BANNED.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_BANNED));
        }

        // 构造更新对象
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        // 回复数 = 原回复数 + 1
        updateArticle.setReplyCount(article.getReplyCount() + 1);
        updateArticle.setUpdateTime(new Date());
        // 执行更新
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            // 打印日志
            log.warn(ResultCode.ERROR_SERVICES.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
    }





}
